Motion Capture T-pose Bent At Hips
The video author is using Blender 2.77a, you are using 2.79. This is important since Blender got a few tweaks on importing Collada files.

I am using 2.79b and tried to replicate your problem. I don't get the same problem but I do get issues when importing Collada if I do it the way its done in the video. I was able to solve it with this setting:



This fixed my issues, I hope it fixes yours.

Steps taken:


Exported character from MakeHuman as Collada file with Mocap skeleton
Imported Collada file in Blender with the "Auto Connect" setting
Selected the skeleton. Made sure its in Object Mode
In the MakeWalk v1.1.0 panel, pressed Load and Retarget and selected the Mocap file
Played the animation




It is also worth noting that I downloaded the "Daz friendly" version of the Mocap Files.